@Account Closed good post! There are a few other strategies for lowering start up costs that you did not mention.
RENTAL FURNITURE!
I mean if your business already does rental arbitrage with landlords properties, why not do it with a big companies furniture also? My company runs 32 Units in Airbnb. Some of the houses we started them off by renting an entire house of furniture for about $300/month. We did buy dishes and towels ($500), but rented most everything else. Our profit went from $1500/month down to $1200/month on most of the units we rent furniture at, but so much less $$ up front, so that the ROI is WAY better!
Then over a period of the next couple months, if the unit is doing well, we start to buy pieces that will go well in that house. After about 3 months, we pick a couple days, and block the calendar. We call the rental company to come and return the rental furniture, and fill it will purchased item.
You can get much better stuff at better deals when you spread out the purchasing period over 3 months. Also, you can just save your profits from the first couple months, and use that cash for the furniture.
We like to get some guest feedback from each house, and use that information to determine a theme, and inform the design process as we further develop the space. If we get a lot of negative feedback, then maybe we would consider not further developing that peticular space, and just ride out the current lease before moving on.
That was a free one, but just one of the many strategies we use in our STR business. Good Luck!